Abrasive wheel dressing device



Dec. 7, 1,965 P. J. PITCL ETAL BRASIVE WHEEL DRESSING DEVICE Filed May3l, 1963 u 5N www, m, K N/ P cpm mTomr/L AL P. E m M J. Eu m am@ LE @MZMA JK ,5, m H

United vStates Patent Office 3,221,727 Patented Dec. 7, 1965 Calif.

Filed May 31, 1963, Ser. No. 284,663 1` Claim. (Cl. 12S-11) Thisinvention relates to a dresser device for an abrasive wheel grinder andmore particularly to a manually operated device.

Manual techniques for dressing of abrasive stones and the like have forthe most part been dangerous in practice, time consuming, and wastefulof materials. In many instances, the equipment employed in the manualmethods has been hazardous to the operator. The results of manualdressing for the most part have been substandard.

It is a principal object of the invention to provide a simple devicethat may be used in the manual dressing of the surface of an abrasivegrinding Wheel.

A still further object of the invention is` to provide a manuallyoperated dresser that is safe to use and is economical of time andmaterial.

The dresser of the invention comprises a guide frame having anelongated, slotted arm and support means for connecting the frame to thegrinding device including means for orienting the dresser to hold thearm of the frame parallel to a grinding surface of the abrasive wheelbeing dressed. The dresser includes a tool holder which is movable alongthe arm and which adjustably holds a dressing tool with a working end ofthe tool reaching through the slot of the arm to the proximity of thegrinding surface of the abrasive wheel.

Additional objects and advantages of the device of the invention willbecome clear in light of the following specification and drawingwherein:

FIG. 1 is a perspective view of an abrasive wheel grinder having twoabrasive wheels with a frame of the dresser of the invention beingmounted on the guard of each of the Wheels;

FIG. 2 is an enlarged, fragmentary, sectional view taken along line 2-2of FIG. l;

FIG. 3 is a fragmentary. vertical, sectional view taken along line 3-3of FIG. 2; and

FIG. 4 is a longitudinal, sectional view taken along line 4-4 of FIG. 3.

There is illustrated in FIG. 1 an abrasive grinder 10 comprising acentrally located electric motor 12 having a driving shaft supporting atits opposite ends abrasive grinding wheels 14 and 16. The abrasivewheels 14 and 16 are enclosed by conventional circular guards 18 and 20.The motor is controlled by a switch 22.

Each of the abrasive wheels 14 and 16, as illustrated in FIG. l, issupplied with a Wheel dresser 24 of the invention. The dresser 24 of theabrasive wheel 14 is incomplete in that it is not illustrated with adressing tool holder and dressing tool. The dresser 24 includes asupport means 26 which is attached to a grinding wheel guard 18 or 20.The support means 26 includes a support arm 28 and orienting means 30for placing the support arm in a plane perpendicular to the major axisof the abrasive grinding wheels 14 and 16. The inner end of the supportarm 26 is held to the guard 18 or 20 by a single bolt 31. Referring toFIG. 4, it will be seen that the inner face of the support arm 28 in thearea of the bolt 31 is closely spaced to but does not contact the wallof the guard 20. This structure is designed to facilitate orienting ofthe dressing device with respect to the abrasive grinding wheel. Moreexactly speaking, the orienting means 30, in the particular embodimentillustrated, for placing the support arm 28 in a plane perpendicular tothe major axis of the grinding wheel 16 comprises three levelling screws32. The three levelling screws 32 are of a setscrew nature and are heldwithin threaded holes, located about the bolt 31, at the inner end ofthe support arm 28. The levelling screws 32 have their inner endsabutting againstl the wall of the guard 20. By the proper adjustment ofthe three levelling screws 32, the support arm 28 may be placed in aplane perpendicular to the axis of rotation of the grinding Wheel 14 or16.

The support arm 28 (see FIG. 4) at its outer end carries on one surfacea transverse groove 38 in which there is iitted a connecting arm 40 of adressing or guide frame 42. The guide frames 42 of the two grindingwheels 14 and 16 are mirror images, one being a left-hand frame and theother a right-hand frame. A bolt 44 holds the dressing frame 42 to thesupport arm 28. The connecting arm 40 is desirably slotted at 43 toprovide for a measure of adjustment of the dressing frame 42 relative tothe support arm 28.

The guide frame 42 is a one-piece casting and includes a slotted, firstoperative or guide arm 48 which is perpendicular to and integral withthe connecting arm 40. The slotted irst arm 48 with the device in itsinstalled position parallels the major axis of the grinding wheel 14 or16. A slotted, second guide arm 50 is perpendicularly disposed to thefirst arm and parallels the connecting arm 40 of the dressing frame 42and the face of the grinding Wheel 14 or 16. When the dresser 24 of theinvention is installed, slot 49 of the first arm 48 extends across theWidth or the thickness of the grinding wheel 14 or 16 and slot 51 of thesecond arm 50 extends inwardly from the perimeter of the respectivegrinding wheel as best seen in FIG. 2.

The outer faces of the two guide arms 48 and 50 are machined to provideground Ways for a dressing tool holder 54. The dressing tool holder 54may be used with either the leftor right-hand version of the frame 42.As best seen in FIG. 3, the dressing tool holder 54 includes acylindrical, upper portion 56 which has an internally-threaded, centralhole 58 along its axis, which hole receives the external threads of anelongated dressing tool 60. The inner end 62 of the dressing tool 60 isthe working end of the tool and mounts a small industrial diamond 64.The outer end 66 of the tool 60 is knurled to provide a friction area tobe grasped by the operator in threading the tool 60 towards and awayfrom the grinding wheel 16. The upper, cylindrical portion 56 of thedressing tool holder 54 terminates in a hexagonal nut 68 which at itsopposite sides is provided with downwardly extending guide-engagingflanges and 72. A liber gasket washer 69 positioned in a recess of theunderside of the hexagonal nut 68 cleanses the threads of the tool 60.With the dressing tool holder 54 mounted on either of the two operativearms 48 and 50, the opposing flanges 70 and 72 slidably engage themachined edges 74 and 76 of the respective two arms, which longitudinaledges serve as the guide means for the tool. The machined undersurfaceof the tool holder 54 slidably engages the ways provided by the machinedupper surfaces of the operative guide arms 48 and 50.

The wheel dresser of the invention may be used for either pedestal orbench grinders and is inexpensive and compact. The dresser of theinvention may be mounted permanently yon the grinder guard, thus beingalways ready for instant use. The tool holder, depending upon which ofthe two operative arms 48 and 50 in which it is mounted, may be used fordressing the face or the side of the abrasive wheel. The tool holder ishand fed for any speed required to dress the wheel. With the use of thedresser of the invention, an abrasive wheel may be kept square and thecorners sharp. There is a minimum of vibration experienced in the use ofthe dresser of the invention. The device is readily installed requiringonly a drilled and tapped hole in the grinder housing for attachingsupport means 26. The three levelling screws 32 permit ready alignmentof the dresser with respect to the abrasive wheel.

Although an exemplary embodiment of the invention has been disclosedherein for purposes of illustration, it will be understood that variouschanges, modifications, and substitutions may be incorporated in suchembodiment without departing from the spirit of the invention as definedby the claim which follows.

We claim:

A manually operated grinding wheel dressing device, said devicecomprising:

a support arm for attachment to a grinding wheel guard, said support armbeing attachable to the grinding wheel guard about a single site;

adjustable means for orienting the support arm with reference to thegrinding Wheel guard to place said support arm in a plane perpendicularto the major axis of the grinding wheel, said orienting means beingadjustable to move the support arm toward and away from the grindingWheel guard about the site of attachment of said support arm to saidgrinding wheel guard and said orienting means including leveling screwsthreadedly held to said support arm with their inner ends abuttingagainst the wall of the grinding wheel;

a dressing frame removably held to the support arm,

4 said frame having a slotted first arm paralleling when installed themajor axis of the grinding wheel and a slotted second armperpendicularly disposed to the first arm and paralleling the face ofthe grinding wheel with the slot of the first arm extending across thewidth of the grinding wheel and with the slot of the second armextending inwardly from the perimeter of the grinding wheel; a dressingtool holder adapted to be slidably held to a single one of said firstan-d said second arms of the dressing frame; and

a dressing tool threadedly held to the dressing tool holder with itsmajor axis perpendicular to a surface of said single one of the two armsand with the working end of the tool reaching through the slot of thearm to the proximity of the grinding wheel.

References Cited by the Examiner UNITED STATES PATENTS 2,484,404 10/1949Doerer 125--1l.l6 2,748,761 6/1956 Winegar 12S- 11.16 2,872,758 2/1959Hoerst 125-11 X 2,934,057 4/1960 Weining 12S-11.16

FOREIGN PATENTS 573,895 4/1933 Germany.

HAROLD D. WHITEHEAD, Primary Examiner.

J. SPENCER OVERHOLSER, Examiner.

JOHN E. PEELE, IR., Assistant Examiner.

